Eaton’s Cooper Power series elbow arresters provide shielded deadfront arrester protection with metal oxide varistor elbow and parking stand arresters used in pad-mounted, transformer and entry cabinets, vaults, switching enclosures and other installations.
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System voltage (V rms) |
Commonly applied arrester duty-cycle (MCOV) voltage rating (kV rms) on distribution systems |
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Nominal voltage |
Maximum voltage |
4-wire multigrounded neutral wye |
3-wire low impedance grounded |
Delta and 3-wire high impedance grounded |
2400 |
2540 |
– |
– |
3 (2.55) |
4160 Y/2400 |
4400 Y/2540 |
3 (2.55) |
6 (5.1) |
6 (5.1) |
4260 |
4400 |
– |
– |
6 (5.1) |
4800 |
5080 |
– |
– |
6 (5.1) |
6900 |
7260 |
– |
– |
9 (7.65) |
8320 Y/4800 |
8800 Y/5080 |
6 (5.1) |
9 (7.65) |
– |
12000 Y/6930 |
12700 Y/7330 |
9 (7.65) |
12 (10.2) |
– |
12470 Y/7200 |
13200 Y/7620 |
9 (7.65) or 10 (8.4) |
15 (12.7) |
– |
13200 Y/7620 |
13970 Y/8070 |
10 (8.4) |
15 (12.7) |
– |
13800 Y/7970 |
14520 Y/8388 |
10 (8.4) and 12 (10.2) |
15 (12.7) |
– |
13800 |
14520 |
– |
– |
18 (15.3) |
20780 Y/12000 |
22000 Y/12700 |
15 (12.7) |
21 (17.0) |
– |
22860 Y/12000 |
22000 Y/12700 |
15 (12.7) |
21 (17.0) |
– |
24940 Y/14400 |
26400 Y/15240 |
18 (15.3) |
27 (22.0) |
– |
27600 Y/15935 |
29255 Y/16890 |
21 (17.0) |
– |
– |
34500 Y/19920 |
36510 Y/21080 |
27 (22.0) or 30 (24.4) |
– |
– |
46000 Y/26600 |
48300 Y/28000 |
36 (29.0) |
– |
– |
Maximum discharge voltage (kV crest) 8/20 µs current wave |
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Duty cycle voltage rating (kV) |
MCOV (kV) |
Equivalent front-of-wave (kV crest)* |
1.5 kA |
3 kA |
5 kA |
10 kA |
20 kA |
3 | 2.55 | 11 | 9 | 9.7 | 10.7 | 11.4 | 13 |
6 | 5.1 | 22 | 18.0 | 19.4 | 20.8 | 22.7 | 26 |
9 | 7.65 | 31.7 | 26 | 28 | 30 | 32.8 | 37.4 |
10 | 8.4 | 33 | 27 | 29.1 | 31.2 | 34.1 | 38.9 |
12 | 10.2 | 41.5 | 33.9 | 36.6 | 39.2 | 42.9 | 48.9 |
15 | 12.7 | 51.8 | 42.4 | 45.7 | 49 | 53.6 | 61.1 |
18 | 15.3 | 62.2 | 50.9 | 54.9 | 58.8 | 64.3 | 73.4 |
21 | 17.0 | 66 | 54.0 | 58.2 | 62.4 | 68.2 | 77.9 |
24 | 19.5 | 77 | 63.0 | 67.9 | 72.8 | 79.6 | 90.8 |
27 | 22.0 | 87.2 | 71.4 | 76.9 | 82.4 | 90.1 | 103 |
30 | 24.4 | 97.1 | 79.5 | 85.7 | 91.8 | 100.0 | 115.0 |
33 | 27 | 108 | 87.8 | 95.1 | 102 | 112 | 127 |
36 | 29 | 116 | 95.3 | 103 | 110 | 120 | 137 |
*Equivalent front-of-wave voltage is the expected discharge voltage of the arrester when tested with a 5 kA current surge cresting in 0.5 µs |
Maximum discharge voltage 8/20 µs current wave (kV crest) |
|||||||
Duty cycle voltage rating (kV) |
MCOV (kV) |
Front-of-wave protective level* (kV crest) |
1.5 kA |
3 kA |
5 kA |
10 kA |
20 kA |
27 |
22.0 | 105.0 | 75.0 | 82.0 | 87.4 | 96.2 | 110.0 |
30 | 24.4 | 112.0 | 79.5 | 85.7 | 91.8 | 100.0 | 115.0 |
33 | 27 | 108 | 87.8 | 95.1 | 102 | 112 | 127 |
36 | 29 | 116 | 95.3 | 103 | 110 | 120 | 137 |
*Equivalent front-of-wave voltage is the expected discharge voltage of the arrester when tested with a 5 kV current surge cresting in 0.5 µs |
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